Add comment for QuicFramer::AppendPacketHeader. Correct/improve DLOG output. Clean up problems foun…

net/quic/quic_framer.h

Index: net/quic/quic_framer.h
diff --git a/net/quic/quic_framer.h b/net/quic/quic_framer.h
index 7b1a55ec13887f18ec8d53f1a0c3bd2ee60035b0..a3cc5fa3fdf3ce25aa0953c8f48f970acbbd69f3 100644
--- a/net/quic/quic_framer.h
+++ b/net/quic/quic_framer.h
@@ -459,6 +459,10 @@ class NET_EXPORT_PRIVATE QuicFramer {
 
   // The Append* methods attempt to write the provided header or frame using the
   // |writer|, and return true if successful.
+
+  // If header.public_header.version_flag is set, the version in the
+  // packet will be set -- but it will be set from quic_version_ not
+  // header.public_header.versions.
   bool AppendPacketHeader(const QuicPacketHeader& header,
                           QuicDataWriter* writer);
   bool AppendTypeByte(const QuicFrame& frame,